[vtkusers] aboat SetOrigin and SetPosition

[yin wei]

I counter a problem:In my project , I want to rotate a model around any 
points which I set  as a parameter manually.I do it successfully in one 
progam file use vtkActor's menber founctins such as 'SetOrigin' and 
'SetPosition' like this:
	float center[3];
	float bounds[6];
	objActor->GetBounds(bounds);
	center[0]=0.5*(bounds[0]+bounds[1]);
	center[1]=0.5*(bounds[2]+bounds[3]);
	center[2]=0.5*(bounds[4]+bounds[5]);
	objActor->SetOrigin(center);
	objActor->SetPosition(-center[0],-center[1],-center[2]);
But I am failed in another project with the above code.

How can I do it ? And what do 'Origin' or 'Position' mean set by 
'SetOrigin' or 'SetPosition'?

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